US-12617109-B2 - Razor cartridge

US12617109B2US 12617109 B2US12617109 B2US 12617109B2US-12617109-B2

Abstract

A razor cartridge is proposed. The razor cartridge may include at least one blade having a cutting edge and a blade housing accommodating the at least one blade in a longitudinal direction. The razor cartridge may also include a guard frame accommodating the blade housing to be movable forwards and backwards, in which the guard frame includes a first front supporter provided in front of the blade housing and coming into contact with skin during a shaving process. The blade housing may include a second front supporter provided between the blade and the first front supporter and coming into contact with skin during the shaving process. A topmost portion of the second front supporter may be higher than a topmost portion of the first front supporter.

Inventors

Ji Hoon Yang
Se Jun JANG

Assignees

DORCO CO., LTD.

Dates

Publication Date: 20260505
Application Date: 20240509
Priority Date: 20221118

Claims (20)

1 . A razor cartridge comprising: at least one blade having a cutting edge; a blade housing accommodating the at least one blade in a longitudinal direction; and a guard frame accommodating the blade housing to be movable forwards and backwards, the guard frame comprising a first front supporter provided in front of the blade housing and configured to contact skin during a shaving process, the blade housing comprising a second front supporter provided between the blade and the first front supporter and configured to contact skin during the shaving process, and a topmost portion of the second front supporter being higher than a topmost portion of the first front supporter.
2 . The razor cartridge of claim 1 , wherein a protrusion value of the cutting edge with respect to a local contact plane connecting the first front supporter and the second front supporter is greater in a state that the blade housing is at a rearmost position relative to the guard frame than in a state that the blade housing is at a foremost position relative to the guard frame.
3 . The razor cartridge of claim 2 , wherein the cutting edge is positioned lower than the local contact plane in the state that the blade housing is at the foremost position relative to the guard frame.
4 . The razor cartridge of claim 3 , wherein the protrusion value of the cutting edge with respect to the local contact plane ranges from −0.25 mm to −0.08 mm in the state that the blade housing is at the foremost position relative to the guard frame.
5 . The razor cartridge of claim 3 , wherein the cutting edge is positioned closer to the local contact plane in the state that the blade housing is at the rearmost position relative to the guard frame than in the state that the blade housing is at the foremost position relative to the guard frame.
6 . The razor cartridge of claim 5 , wherein the protrusion value of the cutting edge with respect to the local contact plane ranges from −0.17 mm to −0.05 mm in the state that the blade housing is at the rearmost position relative to the guard frame.
7 . The razor cartridge of claim 1 , wherein a protrusion value of the cutting edge with respect to a local contact plane connecting the first front supporter and the second front supporter is different by 27 μm to 81 μm between a state that the blade housing is at a foremost position relative to the guard frame and a state that the blade housing is at a rearmost position relative to the guard frame.
8 . The razor cartridge of claim 7 , wherein: the blade comprises a first blade positioned adjacent to the second front supporter, and a second blade positioned behind the first blade, and the protrusion value of the cutting edge of the first blade with respect to the local contact plane is different by 27 μm to 81 μm and the protrusion value of the cutting edge of the second blade with respect to the local plane is different by 51 μm to 152 μm between the state that the blade housing is at the foremost position relative to the guard frame and the state that the blade housing is at the rearmost position relative to the guard frame.
9 . The razor cartridge of claim 1 , wherein a shaving angle of the cutting edge with respect to a local contact plane connecting the first front supporter and the second front supporter is smaller in a state that the blade housing is at the rearmost position relative to the guard frame than in a state that the blade housing is at the foremost position relative to the guard frame.
10 . The razor cartridge of claim 9 , wherein the shaving angle of the cutting edge with respect to the local contact plane ranges from 17 degrees to 40 degrees in the state that the blade housing is at the foremost position relative to the guard frame.
11 . The razor cartridge of claim 9 , wherein the shaving angle of the cutting edge with respect to the local contact plane ranges from 15 degrees to 36 degrees in the state that the blade housing is at the rearmost position relative to the guard frame.
12 . The razor cartridge of claim 1 , wherein a shaving angle of the cutting edge with respect to a local contact plane connecting the first front supporter and the second front supporter is different by 1.8 degrees to 4.2 degrees between a state that the blade housing is at the foremost position relative to the guard frame and a state that the blade housing is at the rearmost position relative to the guard frame.
13 . The razor cartridge of claim 1 , wherein: the blade comprises a first blade positioned adjacent to the second front supporter, and a second blade positioned behind the first blade, the blade housing or the guard frame further comprises a rear supporter provided in back of the blade and coming into contact with skin during a shaving process, a protrusion value of the cutting edge of the second blade with respect to a shaving plane connecting the second front supporter and the rear supporter is greater than a protrusion value of the cutting edge of the first blade with respect to the shaving plane, and a protrusion value of the cutting edge of the second blade with respect to a local contact plane connecting the first front supporter and the second front supporter is smaller than a protrusion value of the first blade with respect to the local contact plane in a state that the blade housing is at a foremost position relative to the guard frame and in a state that the blade housing is at a rearmost position relative to the guard frame.
14 . The razor cartridge of claim 1 , wherein: the blade housing or the guard frame further comprises a rear supporter provided in back of the blade and coming into contact with skin during a shaving process, and a local contact plane connecting the first front supporter and the second front supporter is positioned lower than a shaving plane connecting the second front supporter and the rear supporter above the first front supporter, and higher than the shaving plane above the rear supporter in a state that the blade housing is at the foremost position relative to the guard frame.
15 . The razor cartridge of claim 14 , wherein an angle between the local contact plane and the shaving plane ranges from 2 degrees to 15 degrees in the state that the blade housing is at the foremost position relative to the guard frame.
16 . The razor cartridge of claim 1 , wherein: the blade housing or the guard frame further comprises a rear supporter provided in back of the blade and coming into contact with skin during a shaving process, and a local contact plane connecting the first front supporter and the second front supporter is positioned lower than a shaving plane connecting the second front supporter and the rear supporter above the first front supporter, and higher than the shaving plane above the rear supporter in a state that the blade housing is at the rearmost position relative to the guard frame.
17 . The razor cartridge of claim 16 , wherein an angle between the local contact plane and the shaving plane ranges from 1 degrees to 10 degrees in the state that the blade housing is at the rearmost position relative to the guard frame.
18 . The razor cartridge of claim 1 , wherein a height difference between a topmost portion of the first front supporter and a topmost portion of the second front supporter ranges from 10 μm to 500 μm.
19 . The razor cartridge of claim 1 , wherein a gap between the first front supporter and the second front supporter ranges from 0.8 mm to 2.0 mm in a state that the blade housing is at a foremost position relative to the guard frame.
20 . The razor cartridge of claim 1 , wherein a gap between the first front supporter and the second front supporter ranges from 1.3 mm to 3.1 mm in a state that the blade housing is at a rearmost position relative to the guard frame.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This is a continuation application of International Application No. PCT/KR2023/018415 filed on Nov. 16, 2023, which claims the benefit of Korean Patent Application Nos. 10-2022-0155462, filed on Nov. 18, 2022 and 10-2023-0150932, filed on Nov. 3, 2023 in the Korean Intellectual Property Office, the disclosure of each of which is incorporated herein by reference in its entirety. BACKGROUND Technical Field The disclosure relates to a razor cartridge, and more particularly to a razor cartridge in which at least one blade is accommodated. Description of Related Technology In general, a razor refers to a device that is used to cut body hair such as fine hair and beard from a face or body, and includes a razor handle for gripping, and a razor cartridge with a blade for shaving while being in contact with skin. SUMMARY One aspect is a razor cartridge capable of linear motion, which has an improved shaving efficiency while causing less irritation to skin. The aspects of the disclosure are not limited to the aspects disclosed herein, and other aspects not mentioned here may become apparent to those skilled in the art from the following description. Another aspect is a razor that includes at least one blade having a cutting edge; a blade housing accommodating the at least one blade in a longitudinal direction; and a guard frame accommodating the blade housing to be movable forwards and backwards, in which the guard frame includes a first front supporter provided in front of the blade housing and coming into contact with skin during a shaving process, the blade housing includes a second front supporter provided between the blade and the first front supporter and coming into contact with skin during the shaving process, and a topmost portion of the second front supporter is higher than a topmost portion of the first front supporter. Other details of the disclosure are included in the detailed description and the accompanying drawings. According to the embodiments of the disclosure, the effects are at least as follows. A shaving efficiency is improved while causing less irritation to skin. The effects of the disclosure are not limited to those described above, and various other effects are included in the following description. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a lateral view schematically illustrating a razor assembly according to an embodiment of the disclosure. FIG. 2 is a lateral view schematically illustrating a razor cartridge according to an embodiment of the disclosure. FIG. 3 is a lateral view schematically illustrating that a blade housing of a razor cartridge according to an embodiment of the disclosure is at a foremost position. FIG. 4 is a lateral view schematically illustrating that a blade housing of a razor cartridge according to an embodiment of the disclosure is at a rearmost position. FIG. 5 is a lateral view schematically illustrating a razor cartridge according to another embodiment of the disclosure. FIG. 6 is a lateral view schematically illustrating that a blade housing of a razor cartridge according to another embodiment of the disclosure is at a foremost position. FIG. 7 is a lateral view schematically illustrating that a blade housing of a razor cartridge according to another embodiment of the disclosure is at a rearmost position. DETAILED DESCRIPTION Recently, razor technology that makes the razor cartridge move in linear motion in a shaving direction has emerged as a method of improving a hair cutting efficiency of the blade. In such a razor, the blade is structured to alternate between forward movement in the shaving direction and backward movement in an opposite direction to the shaving direction, and the forward movement of the blade causes strong irritation to a user's skin. The merits and characteristics of the disclosure and a method for achieving the merits and characteristics will become more apparent from embodiments described below in detail in conjunction with the accompanying drawings. However, the disclosure is not limited to the disclosed embodiments, but may be implemented in various different ways. The embodiments are provided to only complete the disclosure and to allow those skilled in the art to understand the category of the disclosure. The disclosure is defined by the category of the claims. In addition, embodiments of the disclosure will be described with reference to cross-sectional views and/or schematic views as idealized exemplary illustrations. Therefore, the illustrations may be varied in shape depending on manufacturing techniques, tolerance, and/or etc. Further, elements in the drawings may be relatively enlarged or reduced for convenience of description. Like numerals refer to like elements throughout. Further, first, second, i), ii), a), b) and the like terms may be used in describing elements according to embodiments of the disclosure. Such terms are used solely for the purpose of differentiating one element f